US5925949A - Disc drive motor with means to center a disc and limit its axial movement - Google Patents

Disc drive motor with means to center a disc and limit its axial movement Download PDF

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Publication number
US5925949A
US5925949A US08/992,063 US99206397A US5925949A US 5925949 A US5925949 A US 5925949A US 99206397 A US99206397 A US 99206397A US 5925949 A US5925949 A US 5925949A
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US
United States
Prior art keywords
stopper
rotor
disc
stator
hub
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US08/992,063
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English (en)
Inventor
Sung Cheon Jung
Jin Ki Min
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Samsung Electro Mechanics Co Ltd
Original Assignee
Samsung Electro Mechanics Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from KR1019970040124A external-priority patent/KR100266737B1/ko
Priority claimed from KR1019970040125A external-priority patent/KR100266738B1/ko
Application filed by Samsung Electro Mechanics Co Ltd filed Critical Samsung Electro Mechanics Co Ltd
Assigned to SAMSUNG ELECTRO MECHANICS CO., LTD. reassignment SAMSUNG ELECTRO MECHANICS CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: JUNG, SUNG CHEON, MIN, JUN KI
Application granted granted Critical
Publication of US5925949A publication Critical patent/US5925949A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/16—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields
    • H02K5/163—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields radially supporting the rotary shaft at only one end of the rotor
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B19/00—Driving, starting, stopping record carriers not specifically of filamentary or web form, or of supports therefor; Control thereof; Control of operating function ; Driving both disc and head
    • G11B19/20—Driving; Starting; Stopping; Control thereof
    • G11B19/2009—Turntables, hubs and motors for disk drives; Mounting of motors in the drive

Definitions

  • This invention relates to a brushless DC motor, more specifically, to a brushless DC motor for a disc drive with higher fidelity which is accomplished by retaining a rotor unmovably in a axial direction using a core insulator and by centering a disc automatically when it is put on the upper end of the rotor.
  • FIG. 1 is a sectional view of a spindle motor of the prior art using a dynamic pressure bearing.
  • a bearing1a is forcibly inserted into a bore formed in an upper and central portion of the base.
  • a shaft 2 is inserted into the bearing1a.
  • a stator1b is provided on the outer circumferential face of the base 1 and a cap-type rotor 3 is secured to the upper end of the shaft 2.
  • a magnet3a is provided on an inner circumferential face of the rotor. When power is applied to the coils wound in the stator a magnetic force arises in the magnet and the rotor rotates.
  • a disc 4 On the upper end of the rotor, a disc 4 is located and a disc clamp 5 is provided at the bottom of a door 6.
  • the conventional spindle motor has a groove 2a for generating a dynamic pressure.
  • the oil filled between the shaft 2 and the bearing 1a generates dynamic pressure and the shaft 2 is retained in the radial direction by the pressure.
  • a disc located on the upper surface of the rotor rotates and information written in the disc is read.
  • the rotor 3 released, or could be moved in the axial direction of the shaft.
  • the shaft is not retained in the axial direction due to the minute space between the shaft 2 and the bearing 1a for generating the dynamic pressure. Therefore, when the grip of the disc clamp 5 is released the rotor 3 could be lifted by magnets formed at the bottom face of the disc clamp 5.
  • a brushless DC motor for a disc drive comprising:
  • a rotor having a hub and a cylindrical wall portion extending downward at the rim of said hub, said rotor being secured to said shaft via said hub;
  • FIG. 1 is a sectional view of a conventional motor.
  • FIG. 2 is a sectional view of the motor according to an embodiment of this invention.
  • FIG. 2a is an enlarged detail of the embodiment in FIG. 2.
  • FIG. 3 is an exploded view, in perspective, of a portion of the motor according to the embodiment of FIG. 2.
  • FIG. 4 is a sectional view of the motor according to another embodiment of this invention.
  • FIG. 5 is an exploded view, in perspective, of the motor according to the embodiment of FIG. 4.
  • FIG. 6 is a sectional view of the motor according to another embodiment of this invention.
  • FIG. 2 is a sectional view of the motor according to an embodiment of this invention.
  • FIG. 3 is an exploded view, in perspective, of a portion of the motor in FIG. 2.
  • a hollow bearing 11 is inserted into a bore at the centeral and upper portion 10a of the base 10.
  • a coil-wound stator 14 is provided at the circumferential face of the upper portion 10a of the base 10.
  • the upper portion 10a of the base is cylindrical and comprises an inner wall for securing a bearing system, an outer wall for securing stator 14 and a top wall connecting the inner and outer walls.
  • a stator insulator 16 insulates stator 14 from base 10.
  • the insulator consists of a cylinder 16a and two groups of first covers 16b extending outwardly at the top and the bottom ends of the cylinder to overlie the upper and lower ends of the stator as shown in FIG. 2
  • a shaft 12 is inserted into the hole of the bearing 11. Oil is filled in the space between the shaft 12 and the bearing 11.
  • a dynamic pressure is generated during rotation of the shaft 12 by the grooves 13 formed at the circumferential face of the shaft.
  • a rotor 18 is located coaxially with the stator 14.
  • the rotor 18 has a hub 17, one or more magnets 19 and a cylindrical wall portion extending downward from the hub.
  • the rotor is engaged with the shaft via the hub.
  • the hub 17 of the rotor 18 is engaged with the shaft 12 at the upper portion of the shaft.
  • the magnets 19 are secured to the inner circumferential face of the cylindrical wall portion of the rotor so that the magnets face the stator with an air gap therebetween.
  • a magnetic force arises in the magnets and the rotor rotates.
  • On the upper surface of the rotor a disc 20 is located and a disc clamp 5 is provided under the door 24.
  • the disc 20 is put on the upper side of the rotor 18.
  • the disc clamp 22 has magnets 23 and rotates idly under the door 21 to press the disc against the upper face of the rotor by magnetic force.
  • a means to oppose lifting of the motor 18 is provided. It opposes the movement of the rotor in the axial direction when the rotor rotates or the disc is lifted off the rotor.
  • a plurality of first stoppers 25 having inward projections at their upper ends are provided at the upper end of the insulator 16a. As seen in FIG. 3 the first stoppers 25 extend axially and are uniformly distributed around the cylinder 16a of the insulator 16.
  • a second stopper 26 is provided at the lower end of the hub 17.
  • the second stopper 26 is hollow circular plate or a flange secured to the lower end of the hub 17.
  • the first stoppers 25 block the second stopper 26 and oppose movement of the rotor 18 in the axial direction.
  • a center adjusting means which includes an upwardly enlarging conical elastomer 28.
  • the bottom of the conical elastomer 28 lies on the flange of the second stopper 26.
  • a plurality of guides 30 having guide surfaces 31 are provided at the upper end of the elastomer 28. The guides contact the surface of the hole formed in the center of the disc.
  • the guides 30 are inserted into slots 32 formed at the upper portion of the rotor such that, the guide surface 31 extend outward from the slots.
  • the elastomer 28 consists of plastic and as shown in FIG. 2a has a circularV-shape notch 29 formed in the outer surface of elastomer 28 to enhance flexibility.
  • Hollow bearing 11 is secured in the upper portion 10a of the base 10 and coil-wound stator 14 is secured on the circumferential surface of the base.
  • the insulator 16 is provided to insulate the stator 14 from the base 10.
  • the shaft 12 is inserted into bearing 11. Oil for dynamic pressure is filled in the space between the shaft 12 and the bearing 11.
  • the hub 17 for rotating the rotor is secured to the upper portion of the shaft 12.
  • the second stopper 26 is provided at the lower end of the hub 17 and, a plurality of the first stopper 25 extends axially from the insulator. A gap of about 1 mm exists between the first stopper 25 and the second stopper 26. Therefore, the first stopper 25 and the second stopper 26 do not impede each other and the rotor rotates normally. When the rotor 18 is lifted upwards the gap is decreased and the first stopper blocks the second stopper.
  • the lift of the rotor 18 occurs as follows.
  • a disc 20 is put on the upper surface of the rotor 18 and the door is closed the disc clamp 22 presses against the upper portion of the disc.
  • a magnet provided at the bottom of the disc clamp 22 attracts the hub 17 and the disc clamp 22 presses against the upper surface of the disc 20.
  • the magnetic force rotates the shaft 12 and the rotor 18 at high speed and the information written in the disc is read.
  • the rotor stops and then the disc clamp 22 is lifted. At this instant the magnet 23 pulls the hub 17 and the rotor 18 upwardly and could release the rotor.
  • the first stopper 25 blocks the second stopper 26 and only disc clamp 22 is released.
  • the center of the disc is adjusted automatically.
  • the plurality of guides 30 are exposed at the upper side of the rotor 18.
  • the disc is engaged by the guide surfaces 31 of the guides.
  • the guides descend slightly.
  • the hole 20a of the disc then completely the receive guide surfaces 31 of the guides and the center of the disc 20 is adjusted to the center of the rotor.
  • the groove 29 absorbs a shock of the weight of a disc.
  • FIG. 4 is the sectional view of a spindle motor according to another embodiment of the invention.
  • the same numerals designate the same structure for all embodiments.
  • the center adjusting means is different from the previous one.
  • the center adjusting means absorbs the shock of the weight of a disc and adjusts the center of the disc to the center of the rotor when the disc is put on the rotor.
  • coil spring elastomer 20a is used.
  • the elastomer 20a is fitted on the outer surface of the projection of the hub 17 and the bottom of the elastomer lies on the plate of the second stopper 26.
  • a plurality of guides 30 are disposed radially at the upper end of the elastomer 28a.
  • the guides 30 have guide surfaces 31 to contact the inner surface of the hole formed in the center of the disc.
  • the guides 30 are inserted into slots 32 formed at the upper portion of the rotor, the guide surfaces 31 are exposed from the slots.
  • the center of the disc is adjusted automatically.
  • the disc engages the guide surfaces 31 of the guides.
  • the guides descend slightly.
  • the hole 20a in the disc then completely receives the guide surfaces 31 and the center of the disc 20 is adjusted to coincide with the center of the rotor 18.
  • FIG. 6 is a sectional view of the spindle motor according to another embodiment of the invention.
  • the same numerals designate the same structure.
  • the first stopper is formed at the upper end of the upper portion of the base and the second stopper is formed as a flange monolithically formed with the hub of the rotor.
  • the operation is the same as the other embodiments and the description of it is omitted.
  • a means to oppose lifting of the rotor 18 is provided between the stator 18 and the hub 17.
  • a plurality of first stoppers are provided around the upper end of the insulator 16a.
  • the second stopper 26 is provided at the bottom end of the hub 17.
  • the second stopper 26 is in the form of a hollow circular plate.
  • the brushless DC motor of the present invention has higher fidelity in that the rotor is retained in the axial direction and cannot be released by virtue of novel structure of the stator insulator which insulates the base from the stator without any additional structure, and thus without need for additional power.
  • the brushless DC motor of the present invention also has the advantage that it is convienient to adjust the center of the disc, when it is loaded.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Brushless Motors (AREA)
  • Permanent Magnet Type Synchronous Machine (AREA)
  • Sliding-Contact Bearings (AREA)
  • Rotational Drive Of Disk (AREA)
US08/992,063 1997-08-22 1997-12-17 Disc drive motor with means to center a disc and limit its axial movement Expired - Lifetime US5925949A (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
KR1019970040124A KR100266737B1 (ko) 1997-08-22 1997-08-22 디지털 비디오디스크용 스핀들모터
KR97-40124 1997-08-22
KR1019970040125A KR100266738B1 (ko) 1997-08-22 1997-08-22 디지털 비디오디스크용 스핀들모터
KR97-40125 1997-08-22

Publications (1)

Publication Number Publication Date
US5925949A true US5925949A (en) 1999-07-20

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
US08/992,063 Expired - Lifetime US5925949A (en) 1997-08-22 1997-12-17 Disc drive motor with means to center a disc and limit its axial movement

Country Status (5)

Country Link
US (1) US5925949A (ja)
JP (1) JPH1173721A (ja)
CN (1) CN1070654C (ja)
DE (1) DE19757265A1 (ja)
SG (1) SG70054A1 (ja)

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6084328A (en) * 1998-02-27 2000-07-04 Matsushita Electric Industrial Co., Ltd. Motor and a heat sink apparatus using the same
US6373655B1 (en) * 1998-06-04 2002-04-16 Seagate Technology, Llc Low cost hydrodynamic spindle
US6417991B1 (en) * 1999-06-08 2002-07-09 Fujitsu Limited Recording disk drive
US20020113503A1 (en) * 2001-02-21 2002-08-22 Canon Kabushiki Kaisha Spindle motor
US6545381B1 (en) * 1999-07-17 2003-04-08 Papst-Motoren Gmbh & Co. Kg Small electric motor with axial bearing
US20050200211A1 (en) * 2004-03-15 2005-09-15 Delta Electronics, Inc. Spindle motor and stator structure thereof
US20060031864A1 (en) * 2004-08-09 2006-02-09 Hiroyuki Kiriyama Spindle motor, disc driving apparatus having the same, and production method thereof
US20060132947A1 (en) * 2004-12-21 2006-06-22 Prodisc Technology Inc. Color wheel and motor thereof
US20070172159A1 (en) * 2003-12-17 2007-07-26 Ntn Corporation Fluid bearing device
US20070210670A1 (en) * 2006-03-07 2007-09-13 Nidec Corporation Motor
US20070239254A1 (en) * 2006-04-07 2007-10-11 Chris Chia System for percutaneous delivery and removal of a prosthetic valve
US20070274002A1 (en) * 2006-05-25 2007-11-29 Samsung Electro-Mechanics Co., Ltd. Spindle motor
US20080073991A1 (en) * 2006-09-27 2008-03-27 Foxconn Technology Co., Ltd. Bearing assembly for cooling fan
US20080218016A1 (en) * 2007-03-05 2008-09-11 Tek-Chain Technology Co., Ltd. Electronic motor apparatus capable of reducing friction
US20090080817A1 (en) * 2007-09-26 2009-03-26 Nidec Corporation Fluid dynamic pressure bearing, spindle motor, disk driver, and production method of the fluid dynamic pressure bearing
US20100141071A1 (en) * 2005-12-22 2010-06-10 Seagate Technology Llc Motor assembly with multifunctional components
US20120139376A1 (en) * 2010-12-06 2012-06-07 Masahiro Nishidate Brushless motor
US20130016932A1 (en) * 2011-07-14 2013-01-17 Asia Vital Components (Shen Zhen) Co., Ltd. Bearing device
US20140063655A1 (en) * 2010-10-19 2014-03-06 Samsung Electro-Mechanics Japan Advanced Technology Co., Ltd. Rotating apparatus capable of improving the shock resistance and method for manufacturing the rotating apparatus

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7001073B2 (en) 2002-03-08 2006-02-21 Minebea Co., Ltd. Hydrodynamic bearing for a spindle motor
DE10254926B4 (de) * 2002-03-08 2006-03-16 Minebea Co., Ltd. Hydrodynamisches Lager für einen Spindelmotor
DE102005014664A1 (de) 2005-03-31 2006-10-05 Hans-Peter Wyremba Elektrische Maschine
CN101778213B (zh) * 2009-01-12 2011-06-15 华晶科技股份有限公司 高噪声环境下的自动对焦方法及其数字取像装置
JP2011172371A (ja) * 2010-02-18 2011-09-01 Nippon Densan Corp モータ、ディスク駆動装置、およびモータの製造方法
US8711515B2 (en) * 2012-08-31 2014-04-29 Nidec Corporation Stopper, motor, and disk drive apparatus
CN102953956B (zh) * 2012-11-01 2015-04-15 华中科技大学 一种无刷空心杯直线电机驱动的压缩机

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4634908A (en) * 1984-06-19 1987-01-06 Ebm Elektrobau Mulfingen Gmbh & Co. External rotor motor with screwed on motor flange
US5264748A (en) * 1990-05-24 1993-11-23 Matsushita Electric Industrial Co., Ltd. Axial-flow fan motor
US5446610A (en) * 1981-09-07 1995-08-29 Papst Licensing Gmbh Disk storage device having a brushless DC drive motor
US5623382A (en) * 1993-01-29 1997-04-22 Matsushita Electrical Industrial Co., Ltd. Disk driving apparatus
US5633856A (en) * 1992-01-24 1997-05-27 Sony Corporation Disc table for disc recording/reproducing apparatus and method for producing same
US5668792A (en) * 1993-12-24 1997-09-16 Daewoo Electronics Co., Ltd. Turntable of a disc player for both a compact disc and a mini disc
US5723927A (en) * 1995-03-31 1998-03-03 Matsushita Electric Industrial Co., Ltd. Dynamic pressure bearing spindle motor
US5747908A (en) * 1994-08-05 1998-05-05 Matsushita Electric Industrial Co., Ltd. Motor including an apparatus for mounting a rotor and stator coil to a printed circuit board

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL8802996A (nl) * 1988-12-07 1990-07-02 Philips Nv Draaitafelsamenstel, werkwijze voor het vervaardigen van een draaitafelsamenstel, alsmede een platenspeler voorzien van een draaitafelsamenstel.
JP2861144B2 (ja) * 1989-11-16 1999-02-24 ソニー株式会社 ディスクチャッキング機構

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5446610A (en) * 1981-09-07 1995-08-29 Papst Licensing Gmbh Disk storage device having a brushless DC drive motor
US4634908A (en) * 1984-06-19 1987-01-06 Ebm Elektrobau Mulfingen Gmbh & Co. External rotor motor with screwed on motor flange
US5264748A (en) * 1990-05-24 1993-11-23 Matsushita Electric Industrial Co., Ltd. Axial-flow fan motor
US5633856A (en) * 1992-01-24 1997-05-27 Sony Corporation Disc table for disc recording/reproducing apparatus and method for producing same
US5623382A (en) * 1993-01-29 1997-04-22 Matsushita Electrical Industrial Co., Ltd. Disk driving apparatus
US5668792A (en) * 1993-12-24 1997-09-16 Daewoo Electronics Co., Ltd. Turntable of a disc player for both a compact disc and a mini disc
US5747908A (en) * 1994-08-05 1998-05-05 Matsushita Electric Industrial Co., Ltd. Motor including an apparatus for mounting a rotor and stator coil to a printed circuit board
US5723927A (en) * 1995-03-31 1998-03-03 Matsushita Electric Industrial Co., Ltd. Dynamic pressure bearing spindle motor

Cited By (26)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6084328A (en) * 1998-02-27 2000-07-04 Matsushita Electric Industrial Co., Ltd. Motor and a heat sink apparatus using the same
US6373655B1 (en) * 1998-06-04 2002-04-16 Seagate Technology, Llc Low cost hydrodynamic spindle
US6417991B1 (en) * 1999-06-08 2002-07-09 Fujitsu Limited Recording disk drive
US6545381B1 (en) * 1999-07-17 2003-04-08 Papst-Motoren Gmbh & Co. Kg Small electric motor with axial bearing
US20020113503A1 (en) * 2001-02-21 2002-08-22 Canon Kabushiki Kaisha Spindle motor
US7699527B2 (en) * 2003-12-17 2010-04-20 Ntn Corporation Fluid bearing device
US20070172159A1 (en) * 2003-12-17 2007-07-26 Ntn Corporation Fluid bearing device
US20050200211A1 (en) * 2004-03-15 2005-09-15 Delta Electronics, Inc. Spindle motor and stator structure thereof
US20060031864A1 (en) * 2004-08-09 2006-02-09 Hiroyuki Kiriyama Spindle motor, disc driving apparatus having the same, and production method thereof
US20060132947A1 (en) * 2004-12-21 2006-06-22 Prodisc Technology Inc. Color wheel and motor thereof
US7893585B2 (en) * 2005-12-22 2011-02-22 Seagate Technology Llc Motor assembly with multifunctional components
US20100141071A1 (en) * 2005-12-22 2010-06-10 Seagate Technology Llc Motor assembly with multifunctional components
US20070210670A1 (en) * 2006-03-07 2007-09-13 Nidec Corporation Motor
US20070239254A1 (en) * 2006-04-07 2007-10-11 Chris Chia System for percutaneous delivery and removal of a prosthetic valve
US20070274002A1 (en) * 2006-05-25 2007-11-29 Samsung Electro-Mechanics Co., Ltd. Spindle motor
US20080073991A1 (en) * 2006-09-27 2008-03-27 Foxconn Technology Co., Ltd. Bearing assembly for cooling fan
US20090066178A1 (en) * 2007-03-05 2009-03-12 Tek-Chain Technology Co., Ltd Electric motor apparatus capable of reducing friction
US20080218016A1 (en) * 2007-03-05 2008-09-11 Tek-Chain Technology Co., Ltd. Electronic motor apparatus capable of reducing friction
US20090080817A1 (en) * 2007-09-26 2009-03-26 Nidec Corporation Fluid dynamic pressure bearing, spindle motor, disk driver, and production method of the fluid dynamic pressure bearing
US20140063655A1 (en) * 2010-10-19 2014-03-06 Samsung Electro-Mechanics Japan Advanced Technology Co., Ltd. Rotating apparatus capable of improving the shock resistance and method for manufacturing the rotating apparatus
US8934196B2 (en) * 2010-10-19 2015-01-13 Samsung Electro-Mechanics Japan Advanced Technology Co., Ltd. Rotating apparatus with increased inner diameter of bearing hole opening
US9064531B2 (en) 2010-10-19 2015-06-23 Samsung Electro-Mechanics Japan Advanced Technology, Co., Ltd. Rotating apparatus capable of improving the shock resistance and method for manufacturing the rotating apparatus
US20120139376A1 (en) * 2010-12-06 2012-06-07 Masahiro Nishidate Brushless motor
US8692436B2 (en) * 2010-12-06 2014-04-08 Tokyo Parts Industrial Co., Ltd. Brushless motor
US20130016932A1 (en) * 2011-07-14 2013-01-17 Asia Vital Components (Shen Zhen) Co., Ltd. Bearing device
US8398307B2 (en) * 2011-07-14 2013-03-19 Asia Vital Components (Shen Zhen) Co., Ltd. Bearing device

Also Published As

Publication number Publication date
CN1209676A (zh) 1999-03-03
CN1070654C (zh) 2001-09-05
SG70054A1 (en) 2000-01-25
JPH1173721A (ja) 1999-03-16
DE19757265A1 (de) 1999-02-25

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